Mythology is a collection of myths, especially one belonging to a particular religious or cultural tradition. We observed that an annotation tool is essential to identify important and complex information from any mythological texts or corpora. Additionally, obtaining highquality annotated corpora for complex information extraction including labeled text segments is an expensive and timeconsuming process. Hence, in this paper, we have designed and deployed an annotation tool for Hindu mythology which is presented as Mytho-Annotator. Its easy-to-use web-based text annotation tool is powered by Natural Language Processing (NLP). This tool primarily labels three different categories such as named entities, relationships, and event entities. This annotation tool offers a comprehensive and adaptable annotation paradigm.